Pump.



A. J. POCOCK.

PUMP.

APPLICATlON FILED AUG. 4. I915.

Patented Oct. 31, 1916.

2 SHEETS-SHEET 1.

A11. POCOCK. PUMP.

APPLICATION FILED AUG.4, I915.

Patented Oct; 31, 1916.

2 SHEETS-SHEET 2.

AUGUSTINE 3. P0600, 01B DAYTON, OHIO.

neonate.

To all whom it may concern:

Be it known that 1, AUGUSTINE J. P0- ooon, a citizen of ,the United States, residing at Dayton, inathe county of Montgomer and State of Ohio, have invented certam new and useful Improvements in Pumps; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to.

the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to certain improvements in pumps of a single-acting singlecylinder type.

The improvements relate to the driving mechanism for the piston and comprise an arrangement of shifting gears and cooperating elements by which the reciprocatory movement is im arted to the piston.

The object o the invention is to rovide an eficient form of driving mec anism which is commercially economical in that it requires practically no machine work preparatory to its assemblage, as will hereinafter more fully appear.

Preceding a detail description of the invention, reference is made to the accompanyin drawings of which Tigures 1 and 2 are vertical elevations of the pump to which my improvements are applied; Fig. 3 is an enlarged sectional elevation through the gear box showing the arrangement of the driving gears and alined parts; and Fig. 4 is a sectional elevatlon through the gear box at right angles to lFi 3.

Tn a detail description, similar reference characters indicate corresponding parts.

Referring more particularly to the drawings, the pump comprises a single cylinder 1 having a chambered head 2 into which the oil is discharged by the piston 7 and from which the oil is discharged into the discharge pipe 3. Extending from the said head is a pipe 3' which supports an air globe 3. The gear box is suitably mounted, a convenient way being upon the pipes 3 and 3'. Within this gear box is housed the driving gears through which reciprocatory movement is imparted to the rack 5 which connects with the piston rod 6 and the gear box which consistsof upper contracted 0rtion 4 and lower widened portion 4'. ri-

Specifloation of Letters Patent. Patented tllmt, 3t, 11%14H,

Application filed August a, ma. serial to. tame.

mary driving gears 11 and 12 are mounted in the upper portion of the gear box on shaft 9 which has bearings in the opposite sides thereof." The gear 11 meshes with the rack 5 constantly and is subjected to reversed movement whereby the said rack is reciprocated. The rack is driven in one direction through the gear 12 which, together with gear 11, is rigid on the shaft 9 and said gear 11 is given a contrary movement through gear 13 on the counter shaft 10 mounted in the lower portion of the gear box. A crank handle 8 is connected to the latter shaft by means of which said shaft is rotated. A smaller gear 'wheel 14 is also mounted upon the shaft 10 and is des%ned to engage and disengage the gear 12. he gears 13 and 14 are rigidly connected to a sleeve 15 whidfi'is loose upon the shaft 10 and adjacent to said gears 13 and 14 are double-faced cam members 16 and 17 which are also rigidly connected to the sleeve 15, so that the cams and gears 13 and 14 have a sliding movement as well as a rotary movement. The said cams have each opposing cam surfaces 18 and stops 19, the latter being arranged at the lower terminals of the cam surfaces 18.

A set of projections 22 operate in connection with each'of the cams. These projections extend from a collar which is rigidly attached to the shaft 10, said projections having surfaces which match with the cam surfaces 18 of said cam members. The working contact between the said projections and the cam surfaces is suflicient to alternately throw the gears 13 and 14 in and out of mesh with the primary driving gears 11 and 12 by sliding the sleeve 15 and when such engagement and disengagement takes place the projections 22 engage the stops or abutments 19 and cause said gears 13 and 14 to rotate one in mesh with its companion gear and the other out of mesh. The cams are so constructed and arranged as to cause a reversal of the driving gears at the limit of each stroke of the piston. The disengagement of the stops 19 with the projections 22 occurs when the shaft 10 is reversed. Looking at Fig. 3, it will be seen that the initial operation of the crank 8 shifts the sleeve 15 and therewith the gear 14 in mesh with the gear 12 and ear 13 away from gear 11. Upon the continued rotation of the shaft 10 through the crank 8, the said gears 14 and 13 rotate, one idle and the other working, and vice versa. A reversal of the shaft 10 V the sleeve 15 causes the stops 19 and '20 to disengage and to move back to cause gears 13 and 11 to engage and to disengage gears 14 and 12 and the operation of driving the rack 5 up and down is repeated. The rack 5 is suitably guided at its upper end, a convenient form of clutch means is a flanged roller which is suitably mounted at the rear of said rack and in engagement therewith. Suitable means are provided for preventing any tendency to rotation of the cams 16 and 17 while the projections" 22 are riding over the surfaces 18 and are imparting a sliding movement to the gears 13 and 14. A convenient form of such means consists of an annular friction surface 21 extending around the sleeve 15 and a resilient brake bar 23 mounted on a suitable part of the gear box and engaging said friction member 21.

aving described my invention, I claim. 1. In a driving mechanism for pumps, the combination with a rack connected with the piston of said pump, of primary driving gears arranged upon a common axis, one of which is in mesh with said rack and the other of which is connected to said rack-meshinggear, shiftable gears adapted to mesh and unmesh with said primary gears to'impart reverse movement to the rack-engaging gear,

double-acting cams, said double-acting cams and shiftable gears being connected and slidably mounted upon a common shaft, and camdriving members rigidly united to said shaft and adapted to impart slidable movement to said shi table gears to bring the same in and out of engagement with the primary driving gears and to rotate said shiftable gears when such engagement takes place, substantially as spec1fied.

In a pump of the type specified, the combination with a cylinder, a plston therein, and a driving rack connected to the rod of said piston, of driving mechanism co operating with said rack to im art reciprocatory movement thereto and comprising united gears 11 and 12 one of which is in mesh with said rack' and the other of which is instrumental in reversing the drive of said rack-engaging gear, driving gears 13 and 14 adapted to alternately enga e and disengage said gears 11 and 12, said riving gears being connected to a sleevev 15, double-acting cams 16 and 17 also connected to said sleeve, said cams having stops 19 arranged adjacent to the lower inclinations of the cams, and projections 22 rigidly mounted upon the shaft which supports said driving gears, cams and their connecting sleeve, sald projections engaging the effective surfaces of the cams and arranged to engage the stops on said cams whereby reciprocating and rotary movements are imparted pio said driving gears, substantially as speci- In testimony whereof I aflix my signature.

AUGUSTINE J. POCOCK. 

